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NASA's CALIPSO caught a top-down glimpse of an unusual atmospheric phenomenon -- polar stratospheric clouds, also known as nacreous clouds -- on January 4, while flying past the east coast of Greenland.

It’s hard to believe that, in this day and age, we don’t have a way to measure sea-level air pressure during hurricanes. NASA researchers, however, are working on a system that will improve forecasting of severe ocean weather by doing just that.